Glass-working machine



Juhe 16, 1925.

J. BRANIGAN GLASS WORKING MACHINE Filed Sept. 27, 1919 Fig,

I/ I [Z M lnvemors U Joseph Bran/g0 Patented June 16, 1925.

uNiTEn JOSEPH BRANIGAN, OF BLOOMFIELD, NEW JERSI-Eif, ASE-IGNGB TQ "WEST COMPANY, INCORPORATED, OF NEW YUR-K, N. Y., A GOREORATKON OF 31E? t,

GLASS -XVGEKING MACHINE.

Application filed September 27, 1919. Serial No. 326,754.

T 0 all whom it may concern:

Be it known that I, JOSEPH BRANIGAN, a citizen of the United States, residin at Bloomfield, in the county of Essex, btate of New Jersey, have invented certain new and useful Improvements in Glass-Working Machines, of which the'following is a full, clear, concise, and exact description.

This invention relates to a glass Working machine and more particularly it relates to a machine for sealing the electrode supporting stems of vacuum tubes to the external glass bulbs orenvelopes.

In the manufacture otvacuum tubes, particularly of the type containing more than one electrode, it is a common expedient to insert the electrode supporting stem in the glass envelope through an opening provided therefor in a constricted portion of the en velope and then to seal the constricted portion of the envelope to the stern.

An object of this invention is to provide an improved apparatus for maintaining the envelope and the stem in the desired relation with respect to each other while the sealing is being made.

The apparatus provided according to the present invention comprises a rotatable shaft on which the electrode support may be mounted. A frame-work fastened to the shaft is provided for holding the bulb of the envelope by means of spring clips. In order to prevent the constricted portion of the envelope from undergoing axial oscillations while the shaft is rotating, a petticoat is provided on the shaft, which petticoat fits snugly in the constricted portion of the envelope. It is also preferable that openings be provided in the petticoat so that heat may pass readily therethrongh to heat the lower portion of the stem, since it has been found that better results are obtained by applying heat to both the stem and the glass envelope in order to seal them together.

This invention will be better understood by reference to the following detailed description taken in connection with the accompanying drawings, in which Fig. 1 represents the preferred form of this invention; Fig. 2 is a lon itudinal section of a portion thereof-and *ig. 3 is a cross-sectional view of a portion thereof.

Referring more particularly to Figure 1, 5 is a rotatable shaft which is supported by a movable arm 8, only a portion of is shown. (fog-wheels 8 and 9 are pr at the lower end of the shalt or 1' {I the same. Frictionally attached to L tion of the rotatable shaft 5 is the trode support 11,.tho flare portion which snugly over the of i It is preferable that the upper shaft 5 be hollow so that the lead 13 may be inserted therein. The velope 15 is held in place by alit of spring clips l6, l7, 18, which are fastened to a circumferentiaily incomplete member 20, which is attached to the rotatable shaft 5 by means of rods 21 and 22. 19 is a petticoat mounted on the shaft 5 of' such a size that it fits snugly within the constricted portion of envelope l5 and prevents any lateral motion thereof when the shaft is rotated. that i 7 pettlcoat 19 be pro r on slots through which it allay res to reach electrode support 11. as able flame for heating the constricted portion of the envelope 15 so that it will lapse and become sealed to the flared por tion 12 of the electrode support. Since it has been found that a better seal is made by the direct heating of the flared portion tion 12. In fact it has been able to apply the direct heat fcr portion 12 prior to H" i e velope 15. This succe in H accomplished by turning on the 1 flame after flame has beer for a definite length time, Q1 23 and may he spacer. that r: r table shaft 5 may successively brought near the two flames by the movement of arm 6.

Fig. 2 is a longitudinal sectional View of the envelope, electrode support and shaft. Reference characters applied in this figure refer to the similar parts in Fig.1.

The cross-sectional view shown inv Fig. 3 may be readily understood by referring to the detailed description given above for Fig. 1.

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lo; {ill}, r e; port for 1 means momma-1o support lor lli tem, and surrounde bulb for inuinmining the bulb in tlr relation to the stem, said means 11m discontinuous surf-use whereby heat 1: applied to the 2. Aniaclmm for sealing support in a e envelope our. shaft, means renipora l v support to s shaft, in in said shaft for holding said en: and around said electrode support means comprising a fluted etticoat on e shaft for steadying said envelope when said shaft is rotating.

3. A. machirefor sealing in m; eleoaror support in an elonmued envelope (1i ing a rotatablr mounting sai of saiol shaft,

compri i151 lie Suppl) the op uivmpe comprising a .7 .7 ,trorle support be- .eoliml to an end of said upportell by said shaft ope. over and around 5 rt, means for heating for heating it poripport.

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